Helion (chemistry): Difference between revisions
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{{short description|Helium-3 isotope nucleus}} |
{{short description|Helium-3 isotope nucleus}} |
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{{other uses|Helion (disambiguation)}} |
{{other uses|Helion (disambiguation)}} |
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A '''helion''' (symbol ''h'') is the [[Atomic nucleus|nucleus]] of a [[helium]] atom, a doubly positively charged [[cation]]. The term ''helion'' is a [[portmanteau]] of ''helium'' and ''ion'', and in practice refers specifically to the nucleus of the [[helium-3]] isotope, consisting of two [[protons]] and one [[neutron]]. The nucleus of the other [[stable isotope]] of helium, [[helium-4]], |
A '''helion''' (symbol ''h'') is the [[Atomic nucleus|nucleus]] of a [[helium]] atom, a doubly positively charged [[cation]]. The term ''helion'' is a [[portmanteau]] of ''helium'' and ''ion'', and in practice refers specifically to the nucleus of the [[helium-3]] isotope, consisting of two [[protons]] and one [[neutron]]. The nucleus of the other [[stable isotope]] of helium, [[helium-4]], consisting of two protons and two neutrons, is called an [[alpha particle]] or an alpha for short. |
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This particle is the daughter product in the beta-minus [[radioactive decay|decay]] of [[tritium]], an isotope of [[hydrogen]]: |
This particle is the daughter product in the beta-minus [[radioactive decay|decay]] of [[tritium]], an isotope of [[hydrogen]]: |
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Revision as of 00:08, 24 March 2024
A helion (symbol h) is the nucleus of a helium atom, a doubly positively charged cation. The term helion is a portmanteau of helium and ion, and in practice refers specifically to the nucleus of the helium-3 isotope, consisting of two protons and one neutron. The nucleus of the other stable isotope of helium, helium-4, consisting of two protons and two neutrons, is called an alpha particle or an alpha for short.
This particle is the daughter product in the beta-minus decay of tritium, an isotope of hydrogen:
CODATA reports the mass of a helion particle as mh = 5.0064127862(16)×10−27 kg[1] = 3.014932246932(74) Da.[2]
Helions are intermediate products in the proton–proton chain reaction in stellar fusion.
An antihelion is the antiparticle of a helion, consisting of two antiprotons and an antineutron.
References
- ^ "2022 CODATA Value: helion mass". The NIST Reference on Constants, Units, and Uncertainty. NIST. May 2024. Retrieved 2024-05-18.
- ^ "2022 CODATA Value: helion mass in u". The NIST Reference on Constants, Units, and Uncertainty. NIST. May 2024. Retrieved 2024-05-18.
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